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Dissertations / Theses on the topic 'Circular polarized'

Author: Grafiati

Published: 4 June 2021

Last updated: 10 February 2022

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1

Edling, Thomas. "Design of circular polarized dual band patch antenna." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-174672.

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At the moment Swedish Transport Administration uses a monitor system that candetect urgent errors as warm ball-bearings and flat wheels etc. with stationarydetectors. To avoid these errors Swedish Transport Administration, UPWIS AB andUppsala University work with a system that will continuously monitoring the train todetect the errors as fast as possible. This will save money in the future for SwedishTransport Administration and all other partners that use the rails.Swedish Transport Administration has already RFID readers beside the rail to detecttrains position. The new monitoring system wil

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2

Abou-Zied, Nour Amro. "Study, design and realization of circular polarized compact antennas : Optimizing performances." Thesis, Limoges, 2016. http://www.theses.fr/2016LIMO0027.

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Les antennes à polarisation circulaire (CP) sont de plus en plus utilisées dans les systèmes de communications spatiaux et terrestres. Le besoin d’intégration est sans cesse plus important, il est donc nécessaire de proposer, de mettre au point des aériens toujours plus compacts et aux performances (adaptation, rayonnement, gain, efficacité, taux d’ellipticité) optimisées. L’objectif de cette thèse est donc de concevoir des antennes planaires, large bande ou multi-bande, à polarisation circulaire et aux performances optimisées. Afin d’atteindre ces objectifs, le travail a été divisée en plusie

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3

Daly, Steven. "Study of the photoionization of chiral molecules using polarized VUV radiation." Thesis, University of Nottingham, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.594763.

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4

Golmohamadi, Marcia. "Multi-Polarized Channel Characterization." ScholarWorks @ UVM, 2019. https://scholarworks.uvm.edu/graddis/1026.

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Machine-to-machine (M2M) communication is becoming an important aspect of warehouse management, remote control, robotics, traffic control, supply chain management, fleet management and telemedicine. M2M is expected to become a significant portion of the Industrial Internet and, more broadly, the Internet of Things (IoT). The environments in which M2M systems are expected to operate may be challenging in terms of radio wave propagation due to their cluttered, multipath nature, which can cause deep signal fades and signal depolarization. Polarization diversity in two dimensions is a well-known t

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5

Li, Tian-Yi, You-Xuan Zheng, and Yong-Hui Zhou. "Iridium(III) phosphorescent complexes with dual stereogenic centers: single crystal, electronic circular dichroism evidence and circularly polarized luminescence properties." Royal Society of Chemistry, 2016. https://tud.qucosa.de/id/qucosa%3A36123.

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Iridium complexes with a chiral metal center and chiral carbons, Λ/Δ-(dfppy)₂Ir(chty-R) and Λ/Δ-(dfppy)2Ir(chty-S), were synthesized and characterized. These isomers have the same steadystate photophysical properties, and obvious offsets in ECD spectra highlight both the chiral sources. Each enantiomeric couple shows mirror-image CPL bands with a dissymmetry factor in the order of 10ˉ³.

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6

Calleau, Antoine. "Broadband circulaly polarized Fabry-Perot antennas for space applications." Thesis, Rennes 1, 2019. http://www.theses.fr/2019REN1S092.

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Les travaux présentés dans cette thèse portent sur la conception de cavités de Fabry-Perot (FP) large bande, en polarisation circulaire. Une cavité compacte créée entre une surface haute impédance (SHI) et une surface sélective en fréquence (SSF) est alimentée par une source polarisée linéairement. La SHI ainsi que la SSF sont toutes deux tensorielles. Il est démontré qu'une telle cavité peut supporter un mode à ondes de fuite hybride, permettant la génération de la polarisation circulaire. La première partie de cette thèse est consacrée à la présentation d'un outil d'analyse numérique basé su

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7

PARTHASARATHY, KRISHNAN V. "MUTUAL COUPLING IN PATCH ANTENNA ARRAYS." University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1148325728.

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8

Tastan, Mehmet. "Analysis And Design Of A Circularly Polarized Microstrip Antenna." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12607868/index.pdf.

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In this study we tried to design a microstrip antenna, to get a suitable radiation pattern for a LEO satellite. Our aim is to get a radiation pattern that has a maximum power which is not in the broadside direction to the antenna surface<br>instead broadside radiation has a relatively lower power density. Maximum power radiation is desired to be at about 30 &ndash<br>50 degrees angle beyond the normal to the antenna surface. We desire circularly polarized radiation. We used two concentric antennas<br>one is a circular patch at the center and the other is an annular ring which is used at the ou

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9

Paryani, Rajesh. "DESIGN OF A WIDEBAND DUAL-POLARIZED CAVITY BACKED SLOT ANTENNA." Doctoral diss., University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2832.

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A new technique for designing wideband dual-polarized cavity-backed slot antennas is presented. The structure is in the form of a double-resonant, dual-polarized slot antenna backed by a shallow substrate integrated cavity with a depth of approximately one tenth the free space wavelength. The presence of the cavity behind the slot enhances the antennaÂ s directivity and reduces the possibility of surface wave propagation in the antenna substrate when the element is used in an array environment. Moreover, the dual-polarized nature of this radiating element may be exploited to synthesize any des

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10

Farooqui, Muhammad Fahad. "Compact circularly polarized slot-ring antenna and microstrip bandpass filter using triangular open-loop resonators." Texas A&M University, 2006. http://hdl.handle.net/1969.1/4969.

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In this thesis two different research topics are undertaken, both in the area of compact RF/microwave circuits design. The first topic involves the design of a compact circularly polarized (CP) slot-ring antenna. A study of several compact CP microstrip and slotline antennas reported in the past has been carried out. In this research, a method of reducing the size of a printed slot-ring antenna is proposed. The reduction in size is achieved by introducing meandered-slot sections in the ring. Circular polarization is achieved by introducing an asymmetry, also a meandered-slot section, and feedi

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11

Wu, Doris I., and James Rieger. "COMPUTER-AIDED DESIGN OF CIRCULARLY-POLARIZED CONFORMAL MICROSTRIP PATCH ANTENNA FOR TELEMETRY APPLICATIONS." International Foundation for Telemetering, 1994. http://hdl.handle.net/10150/608569.

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International Telemetering Conference Proceedings / October 17-20, 1994 / Town & Country Hotel and Conference Center, San Diego, California<br>Planar microstrip antennas are desirable in many telemetry applications because they are small in size, light in weight, and conformal to most surfaces. The design and optimization of circularly-polarized omnidirectional microstrip arrays using a new software simulation tool are discussed in this paper. Critical design issues such as the optimization of each array element for circular polarization and the minimization of mutual couplings as well as

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12

Gon, Masayuki. "Synthesis of Novel π-Conjugated Compounds Based on Tetrasubstituted [2.2]Paracyclophane". 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/204583.

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13

Frazier, Matthew Allen. "Probe of Coherent and Quantum States in Narrow-Gap Based Semiconductors in the Presence of Strong Spin-Orbit Coupling." Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/28935.

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The goal of this project was to study some unexplored optical and magneto-optical properties of the newest member of III-V ferromagnetic structures, InMnSb, as well as InSb films and InSb/AlInSb quantum wells. The emphasis was on dynamical aspects such as charge and spin dynamics in order to address several important issues of the spin-related phenomena. The objectives in this project were to: 1) understand charge/spin dynamics in NGS with different confinement potentials, 2) study phenomena such as interband photo-galvanic effects, in order to generate spin polarized current, 3) probe the eff

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14

Hahlin, Anders. "Magnetism and Structure of Thin 3d Transition Metal Films : XMCD and EXAFS using Polarized Soft X-Rays." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-3407.

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15

Hurt, Martin. "Kruhově polarizovaná sériová anténní řada." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220574.

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This work focuses on the design circularly polarized serial antennas array operate in the ISM band (5.725 GHz to 5.875 GHz). Design of antennas is divided into three parts. In the first part is designed feeding system, followed by two types of circularly polarized antennas and at the last point, these components are integrated. Furthermore, these antennas are fabricated, measured their parameters and used for experimental verification of the influence of multipath transmission in-vehicle.

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16

Mosser, Maëlle. "Molécules chirales à géométrie hélicoïdale : synthèse et modulation de leurs propriétés spectroscopiques par leur environnement." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSEN024/document.

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La chiralité est une propriété essentielle des molécules naturelles, intervenant dans de nombreux mécanismes biologiques du vivant. Elle peut être caractérisée grâce à l’activité chiroptique des molécules chirales, à travers le dichroïsme circulaire, le pouvoir rotatoire, la dispersion rotatoire optique ou encore la luminescence polarisée circulairement. Les molécules biaryles et hélicéniques possèdent des propriétés chiroptiques intenses et sont des molécules de choix pour leurs applications dans de nombreux domaines, de la catalyse à l’optoélectronique.Les travaux réalisés au cours de cette

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17

Whelan, Jedidiah J. "Diverse Polarization Extension to MUSIC Applied to a Circular Array of H-Plane Horns." University of Dayton / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1291326302.

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18

Tia, Maurice. "Dichroïsme Circulaire de Photoélectrons (PECD) sur des systèmes chiraux isolés." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112337.

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Le dichroïsme circulaire de photoélectrons (PECD) se manifeste par une intense asymétrie avant/arrière dans la distribution angulaire de photoélectrons selon l’axe des photons, lors de la photoionisation d’un énantiomère pur de molécule chirale en phase gazeuse par un rayonnement polarisé circulairement. Cette thèse est consacrée à l’étude de ce phénomène, avec le synchrotron de la ligne DESIRS, sur différents systèmes chiraux allant de molécules libres (composés bromés, alanine) aux agrégats de glycidol et aux complexes formés avec l’eau. Pour ce faire, des mesures expérimentales menées à l’a

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19

Parlett, Lucinda Catherine. "Molecules in circularly polarized light." Thesis, University of Cambridge, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.627330.

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20

Lim, Eng G. "Circular polarised microstrip antenna design using segmental methods." Thesis, Northumbria University, 2002. http://nrl.northumbria.ac.uk/1330/.

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Research into the modelling and analysis of microstrip patch antenna have been reported in many studies. These include Transmission Line Modelling, Cavity Modelling, Coplanar Multiport Modelling and Full wave Modelling. Since the electromagnetic field elements are time harmonic, the phasor-form of the Maxwell field equations is used. In this thesis results are presented of the research that has been carried out into the segmental approach for the analysis of the microwave patch antennas. The segmental approach includes the "Segmentation" and the "Desegmentation" methods. In the segmentation me

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21

McDonald, Luke Thompson. "Circularly polarised optics in Scarabaeidae." Thesis, University of Exeter, 2016. http://hdl.handle.net/10871/26536.

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In nature, both fundamental and sophisticated ecological functionality alike are driven by the display or, conversely, the concealment of colour and visual contrast. Through scientific investigation, the evolutionary genius manifested in numerous light manipulating biological systems has provided many blueprints for innovative photonic devices and other smart materials. The development of innovative bioinspired materials that harness the optical properties exhibited by chiral structures, such as those found in certain Scarabaeidae, offer widespread potential. In this thesis, the species-specif

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22

Khoshniat, Ali. "A Linearly and Circularly Polarized Active Integrated Antenna." DigitalCommons@USU, 2011. https://digitalcommons.usu.edu/etd/881.

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This thesis work presents a new harmonic suppression technique for microstrip patch antennas. Harmonic suppression in active integrated antennas is known as an effective method to improve the efficiency of amplifiers in transmitter side. In the proposed design, the antenna works as the radiating element and, at the same time, as the tuning load for the amplifier circuit that is directly matched to the antenna. The proposed active antenna architecture is easy to fabricate and is symmetric, so it can be conveniently mass-produced and designed to have circular polarization, which is preferred in

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23

鄭至廷. "Circular Polarized Reflectarray Using Helical Element." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/80919640686006626378.

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碩士<br>國立彰化師範大學<br>電子工程學系<br>95<br>In this thesis, the circularly polarized reflectarray designed utilizing the helical antenna as an array element, and we presents the design methods of the circularly polarized reflectarray as an unit cell of reflectarray, and the theorem and technology of phase compensation also presented in the thesis. However, the characteristic of the single element infect the performance of the reflectarray seriously, we design an element in the form of axial mode helical antenna which far field pattern is end fire. In order to enhance the circularly polarized field, we u

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Abdulhadi, A. E. "Analysis and design of single-fed circularly polarized circular microstrip antennas." Thesis, 2007. http://spectrum.library.concordia.ca/975279/1/MR28907.pdf.

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A novel design of a circular microstrip antenna with an additional small circular patch excited by a single feed for achieving a dual band frequency operation with circular polarization (CP) is presented. The implemented dual band circularly polarized antenna has a compact configuration that serves the technology demands requirements in mobile unit systems for smaller volume. Simulation and experimental results show that the 10 dB return-loss impedance bandwidth is better than that of a conventional single circular microstrip patch antenna. In addition, a dual frequency band operation at 2.45

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25

Tango, Kung-Sheng, and 唐宮聖. "GPS Dual-Band Circular Polarized antenna Design." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/p8qpdh.

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碩士<br>元智大學<br>電機工程學系乙組<br>107<br>In this thesis,We study GPS dual-frequency circularly polarized antenna. This thesis has 5 chapters. The first chapter introduces the motivation and purpose of this paper,Generally,the GPS antenna on the market is a single L1 (1575MHz) with other frequency bands (WIFI, 3G/4G/5G, Bluetooth, etc.).If the antenna has dual-frequency GPS circular polarization,it can increase the application and improve the delay through the ionosphere [20]. The second chapter is GPS introduction, positioning method and microstrip line theory. The third chapter is to derive the ante

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CHEN, BO-SYUN, and 陳伯勳. "Suspended Substrate Broadband Microstrip Antenna with Circular Polarized Properties." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/c6dnuj.

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碩士<br>大葉大學<br>電機工程學系<br>106<br>Abstract—In this paper, we study a circularly polarized microstrip antenna on a suspended substrate with a coplanar capacitive feed and a slot within the rectangular patch. Although microstrip antenna has been widely used in linear polarization, circular polarization (CP) operation may be obtained by modifying the structure of the basic antenna and/or feed. Modifications include adjusting the size of antenna and cutting a slot inside the rectangular patch,and research the uspended substrate, and this structure can be scaled to any frequency that you want to use.

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LIU, TANG-YU, and 劉瑭育. "Circular Polarized Antenna by Mutual Coupling with CPW-fed." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/s7g2ep.

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碩士<br>大葉大學<br>電機工程學系<br>106<br>This thesisis a novel design of a circularly polarized coplanar waveguide (CPW) feed antenna for WLAN application. The antenna consists of a CPW feed structure, two square slots on either side of the feed end, and two staggered mutual resonance structures inserted into each square slot. The proposed antenna gives a circular polarization at a center frequency of 2.4 GHz, and the designed antenna size is 30 x 40 mm2. First design the simplest antenna, the length change on the reflection coefficient, find the nearest frequency band, and then narrow it so that th

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Hsaio, Yu-Hao, and 蕭宇皓. "Room Temperature Operated Ultraviolet Circular Polarized Metal-GaN Nanolaser." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/44930746405419229318.

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碩士<br>國立交通大學<br>光電工程研究所<br>105<br>In this thesis, we demonstrate a room temperature operated metal-GaN nanolaser and analysis lasing characteristic and polarization state of it. In the first part, we design our gammadion metal-cavity and use FEM to simulate the electric field mode profile. We then define the left-handed and right-handed gammadion pattern on our undoped GaN by e-beam lithography. We then etch down to GaN layer by ICP and finally we coat Al layer. After fabrication procedure, we use SEM to confirm our device fitting our design. We use micro-photoluminescence system to measure th

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29

Huang, Chung-Shao, and 黃仲紹. "Higher-Order Mode Excitation and Circularly Polarized Radiation of CPW-fed Circular Microstrip Antenna." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/81495092823507124363.

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碩士<br>國立臺灣大學<br>電信工程學研究所<br>90<br>Higher-order mode excitation and circularly polarized radiation are two important applications of coplanar waveguide (CPW) fed circular microstrip antenna. In this thesis, design and analysis for these applications are presented. The experimental procedure and results are also described in detail. For excitation of higher-order modes, we introduce the capacitive and inductive coupled feeding structures. By tuning the dimensions of coupled slot and the feed position, higher order modes that we expected from circular microstrip antenna can be excited

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Lee, Wen-Wen, and 李雯雯. "Optimization of Septum Polarizer Design and Polarizer with Stubs to Improve the Circular-Polarized Radiation of the Horn Antenna." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/09827169636771985787.

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碩士<br>元智大學<br>通訊工程學系<br>96<br>A genetic software program is developed to provide seamless integration among commercial codes for analysis and simulation of electromagnetic problems. Combined with the genetic algorithm, the developed program is able to perform automatic tuning of the structures for optimized design of the polarizers in horn antennas. Numerical results show that proper stub insertions may provide additional freedoms to optimally design the polarizer with a better return loss and a flexible phase tuning, which is particularly useful to compensate the deficiency of a horn antenna

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31

Opie, Marc G. W. "Circular polarization from a circular array of linearly polarized rectangular patches with one end shorted." 1989. http://hdl.handle.net/1993/16950.

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32

Kao, Yu-Ting, and 高毓廷. "Novel Switchable Circular Polarized Antenna Based on Substrate Integrated Waveguide." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/n63545.

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碩士<br>淡江大學<br>電機工程學系碩士班<br>106<br>With the rapid progress in wireless communication, adaptive or reconfigurable antenna are required to meet the changing in environmental conditions to achieve the highest performance of wireless communication. Therefore, reconfigurable antennas like frequency switchable antennas, pattern reconfigurable antennas, or polarization switchable antennas have attract many attentions these years. A frequency switchable antenna can avoid frequency deviation, or change its frequency band to the desired communication system. A pattern reconfigurable antenna can change it

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Chang, Hung-Wei, and 張鴻偉. "P Band Circular Polarized Mircostrip Antenna Array for Satellite Communication." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/37464663935055430020.

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碩士<br>大葉大學<br>電信工程學系碩士在職專班<br>93<br>Because of wild coverage and bandwidth, the satellite communications become more and the satellite communications will be more popular and important in the future. For the moment, some satellite communications apply circular polarization to both transmitting and receiving signals . So, the design of circular polarization microstrip antenna will benefit the property of receiving signals greatly. The purpose of this thesis are building an antenna base on Styrofoam that used in structural construction. And then design a circular-polariza

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Paradise, Ruthanne Hassey. "Single molecule chiroptical spectroscopy: Fluorescence excitation circular dichroism and circular polarized luminescence of bridged triarylamine helicenes." 2009. https://scholarworks.umass.edu/dissertations/AAI3380002.

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In this thesis, I describe the first exploratory experimental efforts probing light-matter interactions of chiral systems at the single molecule level. The dissymmetric single molecule chiroptical response in both excitation and emission polarization has been studied for different diastereomeric forms of bridged triarylamine helicenes. Fluorescence excitation circular dichroism (FECD), measuring the dissymmetric absorption with respect to excitation polarization, reports on the response to excitation polarization. The magnitude and distribution of chiroptical single molecule responses suggest

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Yen, Chung-Yu, and 顏崇育. "Study of reconfigurable circular polarized array antenna for 2.4GHz WiFi system." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/83187777038319549205.

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碩士<br>義守大學<br>電機工程學系<br>102<br>The thesis presents three different reconfigurable and circular polarized antennas which are operated at 2.4GHz and targeted for wireless local area network system. All the proposed antennas have single feed structure. The first antenna uses circular arc to control the surface current direction on the antenna so that dual circular polarization can be achieved. The second antenna applies annular line to control the surface current direction on the antenna and, hence, the dual circular polarization is obtained. The third one is a two-element array antenna which con

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Chen, Jia-Sheng, and 陳佳聲. "Design of Diplexer and Circular Polarized Antenna by Substrate Integrated Waveguide technology." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/32729015877049294015.

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碩士<br>國立交通大學<br>電信工程研究所<br>99<br>Recently, a new technique called the substrate integrated waveguide (SIW) has been proposed and developed as relatively attractive for high-power, low-cost, high-quality, and high-density integration of micro- and millimeter-wave components. Characteristics of such SIW structures were similar with the conventional rectangular waveguides. This thesis mainly utilizes this technology to design circular polarized antenna and microwave component. The first topic of this thesis is designing a two-whole SIW coupler and then applying it to design a circular polarized a

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Chien, Hsiao-Ching, and 錢曉晴. "Circular Polarized Slotted Antenna Array Based on Double-Layer Substrate Integrated Waveguide." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/10370523284292600048.

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碩士<br>國立交通大學<br>電信工程研究所<br>99<br>The thesis based on the concept of the waveguide coupling employs resonant slots to couple power from the main waveguide to crossed branch waveguides. An antenna array which is composed of the circularly polarized (CP) four-slots radiated elements can result in a high gain at the broadside direction. The side lobe level (SLL) can be greatly reduced by appropriate design. In the substrate integrated waveguide (SIW), the guided wavelength is less than the wavelength in air. When the array spacing is around a guided wavelength, the grating lobe can be avoided.

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Weng, Kuo-Lin, and 翁國霖. "The Design of Slot-Coupled Dual Circular Polarized Rectenna for Wireless Power Transmission." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/fr55hw.

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碩士<br>國立臺北科技大學<br>電腦與通訊研究所<br>100<br>This paper presents a dual circular polarized rectenna structure with harmonic rejection filter to receive 2.45 GHz WLAN (IEEE802.11b) system for Wireless Power Transmission(WPT). The proposed rectenna is suitable for the subject of wireless receiving, the receiving RF energy is converted to DC in order to charge the rechargeable battery for the purpose of wireless charge. In this paper, proposed a dual-circular polarization filter rectenna for work in 2.45 GHz WLAN system. The structure can be divided into two parts of the design of the antenna and rectif

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CHUANG, CHING-PING, and 莊景評. "Design of Radar and Tag Circular Polarized Antenna for Spine Minimally Invasive Surgery." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/6jg8d4.

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碩士<br>國立中正大學<br>電機工程研究所<br>106<br>In this thesis, circular polarized antennas designed for minimally invasive surgical positioning system is propsed. When the radar system transmits right-hand circular polarized wave, the rotating sense will be changed to left-hand circular polarization after being reflected by the metal objects for odd times. By taking advantage on this feature, the rich multi-path interference in surgical room can be further reduced. Furthermore, circular polarized antennas can ensure a certain reception since wave polarization is easily disturbed through the transmission ch

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Zhang, YIWEI. "CHIRAL POLYMER PHOTODETECTOR." Thesis, 2014. http://hdl.handle.net/1974/8667.

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A polymer photodetector is fabricated using polythiophene with chiral alkyl side chains. The Cotton effect is observed in the CD spectrum of the photodetector, indicating an unequal absorbance of left- and right-handed circular polarized light (CPL). The photodetector is proven to be able to identify incident left- and right-handed CPL. Polymer photodetectors that are made from R- and S-limonene induced achiral polymers are fabricated. A “hot spin-coating” process is introduced to cast uniform limonene induced polymer films. As a result of chirality transfer, Cotton effects are also obser

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Zhang, L., S. Gao, Q. Luo, et al. "Single-Feed Ultra-Wideband Circularly Polarized Antenna with Enhanced Front-to-Back Ratio." 2015. http://hdl.handle.net/10454/7863.

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Yes<br>This communication presents a single-feed ultra-wideband circularly polarized (CP) antenna with high front-to-back ratio (FBR). The antenna is composed of two orthogonally placed elliptical dipoles printed on both sides of a substrate. To realize high FBR, a novel composite cavity is also proposed and integrated with the presented crossed dipoles, which effectively reduces the backlobe of the crossed dipoles. Simulation results are in good agreement with the measured results that demonstrate an impedance bandwidth from 0.9 to 2.95 GHz (106.5%) and a 3-dB axial ratio (AR) bandwidth from

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Hsieh, Tzu-Hao, and 謝子皓. "Design of Dual-Band Circularly Polarized Microwave Polarizer." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/50940601288038242701.

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碩士<br>國立中央大學<br>電機工程學系<br>101<br>In the thesis, a novel design of dual-band circularly polarized polarizer which can convert linear polarization to circular polarization will be present. The frequency selective surface (FSS) design procedure is based on filter synthesizing equivalent circuit. Filter synthesizing method provides design freedom, including the center frequency, band width, substrate selection and so on. A second order Butterworth dual-band filter design procedure is applied for synthesis of dual-band circularly polarized polarizer. Base on the second order Butterworth dual-band e

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Huang, Jyun-Wei, and 黃俊瑋. "CIRCULARLY POLARIZED REFLECTARRAY." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/65063150061453617996.

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碩士<br>大同大學<br>通訊工程研究所<br>93<br>This thesis studies a circularly polarized reflectarray based on a microstrip ring patch as a radiating element. Using microstrip rings for broadband performance combined with variable rotation to achieve the proper phasing between the elements. The ring antennas also have potential advantages of compact size and broader circularly polarized (CP) bandwidth as compared to the patches. In experiments, we build and test two arrays-one is a right-hand circularly polarized array and the other one is a left hand polarization. They are all in a round shape with an 18cm

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Krupová, Monika. "Teorie a aplikace optické aktivity biomolekul." Doctoral thesis, 2021. http://www.nusl.cz/ntk/nusl-447991.

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Title: Theory and Applications of Optical Activity of Biomolecules Author: Monika Krupová Supervisor: prof. RNDr. Petr Bouř, DSc. Institutions: Faculty of Mathematics and Physics, Charles University, and Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic Abstract: This thesis describes how we used several chiroptical spectroscopic methods to study chiral molecules: vibrational circular dichroism (VCD), circularly polarized luminescence (CPL) and magnetic circular dichroism (MCD). VCD and induced lanthanide CPL were used to study the structure of amyloid

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Shakeeb, Marwa. "Circularly Polarized Microstrip Antenna." Thesis, 2011. http://spectrum.library.concordia.ca/7119/1/Shakeeb_MASc_S2011.pdf.

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Tzung-Pei, Wu, and 伍宗培. "Circularly Polarized Printed-Aperture Antenna." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/95180950615057269898.

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碩士<br>大同工學院<br>電機工程研究所<br>86<br>In this thesis, a novel circular polarized aperture antenna is presented. This antenna uses a microstrip line to feed a truncated square aperture. A tuning metal strip is placed across the diagonal line of the aperture. The antenna is suitable in circuit integration that can avoid the difficulty of the coaxial line feed connection. A useful software IE3D is adopted to analyze the antenna based on the integral equation obtained through the use of Green's functions and the method of moment to solve the current distribution on the microstrip line and E-field di

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Li, Tzung-Yi, and 李宗益. "Wideband Circularly Polarized Slot Antenna." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/19793730472336253370.

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碩士<br>臺灣大學<br>電信工程學研究所<br>98<br>An asymmetrical CPW-fed slot antenna with wideband circular polarization is proposed. The antenna has an asymmetrical feeding for the purpose of interfering with the current distribution on the ground. The antenna geometry is the combination of ground loop and signal loop. Besides, the CPW transmission line is attached with series stubs for impedance matching. By adjusting the parameters properly, a wide circular polarization operation bandwidth has been achieved. Based on the above concept, A wideband circularly polarized antenna fed by a microstripline i

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Wang, Sheng-shian, and 王聖憲. "CPW-FED CIRCULARLY POLARIZED ANTENNAS." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/63736901208201217382.

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碩士<br>大同大學<br>通訊工程研究所<br>96<br>In this thesis, a CPW-fed wideband circularly polarized antenna is proposed to provide wide impedance and axial ratio bandwidths simultaneously. The antenna is designed and implemented for the 3-GHz WiMAX access points. The measured 10-dB return loss bandwidth is 38.5 % (2.75~4.058 GHz), the 3dB axial ratio bandwidth is 22.3 % (3.288~4.111 GHz), and the in-band antenna gains lie in the range of 0.5~6.2 dBic. The measured radiation patterns are shown to be satisfactory across the entire operating band 3.4~3.69 GHz for the IEEE 802.16 group standards. The present

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Wu, Jia-Fent, and 吳嘉峰. "Reconfigurable Circularly-Polarized Microstrip Antennas." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/76968067840334439501.

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碩士<br>國立彰化師範大學<br>電機工程學系<br>96<br>This thesis presents the designs for reconfigurable microstrip antenna. Three types of the reconfigurable antenna are studied. The first one is a circularly-polarized (CP) microstrip antenna capable of switching polarisation sense. The microstrip antenna is excited by an open-loop microstrip line through the coupling of a ring slot in the ground plane. The polarisation diversity is achieved by using a pair of pin diodes to reconfigure the flowing path of the current on the open-loop microstrip feed line. The measured results show the 3dB-axial-ratio bandwidth

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林孝承. "Designs of circularly polarized antennas." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/99492762967000289775.

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碩士<br>國立高雄師範大學<br>物理學系<br>95<br>In this thesis, we mainly aims at the circularly polarized antennas. Through analysis and discussion of different antenna designs. Take the circular polarization three conditions of the design bases. In chapter 2 and 3 present two circularly polarized antenna designs. Using an unequal length L-shape coupling microstrip line and cylindrical dielectric resonator to achieve the circularly polarized dielectric resonator antenna. Other design a circular polarized antenna for global positioning system (GPS) by synthesizing two antennas.

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